System and Method for Mapping Reference Signal Sequence in Advanced Long Term Evolution System

ABSTRACT

The present invention provides a method and system for mapping a reference signal sequence in an advanced Long Term Evolution (LTE) system, and the method and the system are used to map the reference signal sequence to an orthogonal frequency division multiplexing symbol of l. The method includes: when the system uses a normal cyclic prefix, determining the symbol l according to an expression, and mapping the reference signal sequence to a location of a sub-carrier k on the symbol l of an antenna port p. The system includes: a mapping module, a first acquiring module and a second acquiring module. The system and the method which are provided ensure the transmission performance while ensuring the interference randomization. In addition, the system and the method are compatible with existing LTE systems, thus realizing high-order Multiple Input Multiple Output (MIMO) transmission, supporting the usage of the corresponding techniques.

TECHNICAL FIELD

The present invention relates to an advanced long term evolution(Further Advancements for E-UTRA, LTE-Advanced or LTE-A) wirelesscommunication system, and in particular, to a system and method formapping a reference signal sequence in a LTE-A system.

BACKGROUND OF THE RELATED ART

Since the Multiple Input Multiple Output (MIMO) technology can increasesystem capacity, improve transmission performance, and be wellintegrated with other physical layer technologies, it becomes a keytechnology of Beyond third Generation (B3G) and fourth Generation (4G)mobile communication systems. However, when channel correlation isstrong, the diversity gain and multiplexing gain due to a multipathchannel will be greatly reduced, thus resulting in largely reducedperformance of a MIMO system.

There is a new MIMO precoding method in the related art, which is anefficient mode of MIMO multiplexing. This method divides a MIMO channelinto a plurality of independent virtual channels through precodingprocesses at a receiver and a transmitter. Since the effect of channelcorrelation is effectively eliminated, the precoding techniqueguarantees stable performance of the MIMO system in a variety ofenvironments.

The Long Term Evolution (LTE) system is an important project of theThird Generation Partnership Project (3GPP). FIG. 1( a) and FIG. 1( b)are diagrams of frame structures for a Frequency Division Duplex (FDD)mode and a Time Division Duplex (TDD) mode of the LTE system,respectively.

In the frame structure of the FDD mode shown in FIG. 1( a), a radioframe of 10 ms is composed of twenty time slots with a length of 0.5 mseach, numbered from 0 to 19, and time slots 2 i and 2 i+1 compose asubframe i with a length of 1 ms.

In the frame structure of the TDD mode shown in FIG. 1( b), a radioframe of 10 ms is composed of two half frames with a length of 5 mseach, and a half frame contains five subframes with a length of 1 mseach. The subframe i is defined as two time slots 2 i and 2 i+1 with alength of 0.5 ms each. Wherein, a special subframe contains threespecial time slots, namely, a Downlink Pilot Time Slot (DwPTS), a GuardPeriod (GP) and an Uplink Pilot Time Slot (UpPTS), of which a proportionrelationship in a subframe has a total of nine configurations as shownin the following Table 1, wherein, T_(s) is a sampling frequency.

TABLE 1 configurations of special time slots in a special subframe Usinga normal cyclic Using an extended cyclic prefix for the downlink prefixfor the downlink UpPTS UpPTS Using a Using an Using a Using an normalextended normal extended configurations cyclic cyclic prefix cycliccyclic prefix of a special prefix for for the prefix for for thesubframe DwPTS the uplink uplink DwPTS the uplink uplink 0  6592 · T_(s)2192 · T_(s) 2560 · T_(s)  7680 · T_(s) 2192 · T_(s) 2560 · T_(s) 119760 · T_(s) 20480 · T_(s) 2 21952 · T_(s) 23040 · T_(s) 3 24144 ·T_(s) 25600 · T_(s) 4 26336 · T_(s)  7680 · T_(s) 4384 · T_(s) 5120 ·T_(s) 5  6592 · T_(s) 4384 · T_(s) 5120 · T_(s) 20480 · T_(s) 6 19760 ·T_(s) 23040 · T_(s) 7 21952 · T_(s) — — — 8 24144 · T_(s) — — —

In the two frame structures, when the system uses the Normal CyclicPrefix (Normal CP), a time slot has a length of seven uplink/downlinksymbols; and when the system uses the Extend CP, a time slot has alength of six uplink/downlink symbols. The aforementioned symbols areOrthogonal Frequency Division Multiplexing (OFDM) symbols.

A Resource Element (RE) is a sub-carrier on a OFDM symbol, while adownlink Resource Block (RB) consists of twelve consecutive sub-carriersand seven (six when the Extended CP is used) consecutive OFDM symbols,which is 180 kHz in the frequency domain, and has a length of a generaltime slot in the time domain, as shown in FIG. 2. The LTE systemallocates resources with a RB as a basic unit during the resourceallocation.

The LTE system supports a MIMO application of four antennas, andcorresponding antenna port #0, antenna port #1, antenna port #2 andantenna port #3 adopt a mode of full bandwidth Cell-specific ReferenceSignals (CRS). When the CP is the Normal CP, locations of these CRSs ina physical RB are shown in FIG. 3( a). When the CP is the Extended CP,locations of these CRSs in a physical RB are shown in FIG. 3( b). InFIG. 3( a) and FIG. 3( b), abscissa 1 refers to serial numbers ofsubframes in the OFDM symbol, i.e., C₁, C₂, C₃ and C₄, which correspondto the logical port #0, the logical port #1, the logical port #2 and thelogical port #3 of the CRSs.

In addition, there are UE-specific reference signals, which are onlytransmitted on locations in the time-frequency domain where theuser-specific Physical Downlink Shared Channel (PDSCH) is. Wherein,functions of these CRSs comprise downlink channel quality measurementand downlink channel estimation (demodulation).

The advanced long term evolution (Further Advancements forE-UTRA,LTE-Advanced or LTE-A) is an evolution version of LTE Release-8.In addition to meeting or exceeding all relevant requirements of 3GPP TR25.913: “Requirements for Evolved UTRA (E-UTRA) and Evolved UTRAN(E-UTRAN)”, IMT-Advanced requirements proposed by the InternationalTelecommunications Union-Radio (ITU-R) are required to be achieved orexceeded. Wherein, requirements of backward compatibility with the LTERelease-8 refer to that terminals of the LTE Release-8 can operate in aLTE-Advanced network; and terminals of LTE-Advanced can operate in a LTERelease-8 network.

Additionally, LTE-Advanced should be able to operate underconfigurations of different size spectrums, including a configuration ofa spectrum wider than that of the LTE Release-8 (such as consecutivespectrum resources of 100 MHz), so as to achieve higher performance anda higher target peak rate.

Since the LTE-Advanced network needs to be able to access LTEsubscribers, an operational band of the LTE-Advanced network shouldcover the current LTE band, while there is already no consecutivespectrum bandwidth of 100 MHz which can be allocated in the band, andtherefore a direct technology to be addressed by the LTE-Advanced is toaggregate a plurality of consecutive component carrier frequencies(spectrums) distributed in different bands by means of a componentcarrier technology, to form a bandwidth of 100 MHz which can be used bythe LTE-advanced. That is, the aggregated spectrum is divided into ncomponent carrier frequencies (spectrums), and the spectrum within eachcomponent carrier frequency (spectrum) is consecutive.

In the LTE-Advanced requirement study report TR 36.814 V0.1.1 proposedin September 2008, it is explicit that the downlink of the LTE-Advancedcan at most support an application of eight antennas. For the purpose ofsupporting the application of 8 antennas and using techniques such asCoordinated Multiple Point (COMP), dual stream beamforming, etc., abasic framework (way forward) for designing downlink reference signalsof the LTE-Advanced is determined for the LTE-Advanced at the 56thconference of 3GPP in February 2009. The downlink reference signalsoperating the LTE-Advanced are defined as two types of referencesignals, i.e., a PDSCH demodulation oriented reference signal and aChannel State Information (CSI) generation oriented reference signal.Moreover, the PDSCH demodulation oriented reference signal istransmitted based on layers, and each layer corresponds to a kind ofreference signal. The maximum of layers supported in the LTE-Advancedsystem is eight.

At present, time frequency locations of reference signals about twolayers in a subframe have already been determined, as shown in FIG. 4(a) and FIG. 4( b), and there are two modes for mapping a sequence, i.e,mapping a sequence to the frequency domain first and then the timedomain; alternatively, mapping sequences one by one according to thephysical RBs, and then mapping the sequences to the frequency domain andthen the time domain, in the physical RBs. However, both schemes have nospecific implementation method, and therefore, it is necessary toprovide a specific implementation method, so as to guarantee anapplication of multi-antenna transmission functions.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is in thatthere is a need to provide a system and method for mapping a referencesignal sequence in a LTE-A system, and the system and the method areused to mapping the reference signal sequence to corresponding physicalresources.

In order to solve the aforementioned technical problem, first, thepresent invention provides a method for mapping a reference signalsequence in an advanced long term evolution system, which is used to mapthe reference signal sequence to an orthogonal frequency divisionmultiplexing symbol l, comprising: determining the symbol l according tothe following expression when the system uses a normal cyclic prefix:

$l = \left\{ {{\begin{matrix}\left. {{l^{\prime}{mod}\; 2} + 2 + {{2'}\left\lfloor {l^{\prime}/2} \right\rfloor}} \right) & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\{{l^{\prime}{mod}\; 2} + 2} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 3},{4\mspace{14mu} {or}\mspace{14mu} 8}} \\{{l^{\prime}{mod}\; 2} + 5} & {{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a\mspace{14mu} {non}\text{-}} \\\; & {{special}\mspace{14mu} {subframe}}\end{matrix}l^{\prime}} = \left\{ \begin{matrix}\; & {{{{n_{s}\mspace{14mu} {mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\{0,1,2,3} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {1,2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}\mspace{14mu} {mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}}}\mspace{14mu}} \\\; & {{a\mspace{14mu} {special}\mspace{14mu} {subframe}},} \\{0,1} & {{{or}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {{{not}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}\mspace{14mu} {mod}\; 2} = 1},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}}}\mspace{14mu}} \\\; & {{a\mspace{14mu} {special}\mspace{14mu} {subframe}},} \\{2,3} & {{{or}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}}\mspace{14mu}} \\\; & {1,2,{6\mspace{14mu} {or}\mspace{14mu} 7}}\end{matrix} \right.} \right.$

wherein,

n_(s) is an index of a time slot in a radio frame.

Preferably, the aforementioned method further comprises mapping thereference signal sequence to a location a_(k,l) ^((p)) of a sub-carrierk on the symbol l of an antenna port p according to the followingexpression:

$a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)}} & {{{when}\mspace{14mu} p} = 8}\end{matrix} \right.$

wherein, a_(k,l) ^((p)) refers to a location of the sub-carrier k on thesymbol l of the antenna port p;

k=5·m′+N _(sc) ^(RB) ·n _(PRB)+1, or k=5·m′+N _(sc) ^(RB) ·n _(PRB);

s=(−1)^(n) ^(PRB) ^(+l′+m′), or s=(−1)^(n) ^(PRB) ^(+l′+m′+n) ^(s) , ors=(−1)^(n) ^(PRB) ^(+l′+m′+└l′/2┘), or s=(−1)^(l′);

m′=0,1 or 2;

n_(PRB) refers to an index of a physical RB allocated by the system;

N^(RB) _(sc) refers to a number of sub-carriers contained in the RB.

The special subframe is a subframe containing DwPTS time slots.

Preferably, the aforementioned method further comprises mapping thereference signal sequence to a location a_(k,l) ^((p)) of a sub-carrierk on the symbol l of an antenna port p according to the followingexpression:

$a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)}} & {{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 0}} \\{{- s} \cdot {r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)}} & {{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 1}}\end{matrix} \right.$

wherein,

a_(k,l) ^((p)) refers to a location of the sub-carrier k on the symbol lof the antenna portp ;

k=5·m′+N _(sc) ^(RB) ·n _(PRB)+1, or k=5·m′+N _(sc) ^(RB) ·n _(PRB);

s=(−1)^(n) ^(PRB) ^(+m′), or s=(−1)^(n) ^(PRB) ^(+m′+n) ^(s) , ors=(−1)^(n) ^(PRB) ^(+l′+m′+└l′/2┘), or s=1;

m′=0, 1 or 2;

n_(PRB) refers to an index of a physical RB allocated by the system;

N_(sc) ^(RB) refers to a number of sub-carriers contained in the RB.

Preferably, the aforementioned method further comprises mapping thereference signal sequence to a location a_(k,l) ^((p)) of a sub-carrierk on the symbol l of an antenna port p according to the followingexpression:

$a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot M_{RB}^{\max,{DL}}}} \right)}} & {{{when}\mspace{14mu} p} = 8}\end{matrix} \right.$

wherein,

a_(k,l) ^((p)) refers to a location of the sub-carrier k on the symbol lof the antenna portp ;

k=5·m′+N _(sc) ^(RB) ·n _(PRB)+1, or k=5·m′+N _(sc) _(RB) ·n _(PRB);

s=(−1)^(n) ^(PRB) ^(+l′+m′), or s=(−1)^(n) ^(PRB) ^(+l′+m′+n) ^(s) , ors=(−1)^(n) ^(PRB) ^(+l′+m′+└l′/2┘), or s=(−1)^(l′);

m′=0, 1 or 2;

n_(PRB) refers to an index of a physical RB allocated by the system;

NR_(sc) ^(RB) refers to a number of sub-carriers contained in the RB.

Preferably, the aforementioned method further comprises mapping thereference signal sequence to a location a_(k,l) ^((p)) of a sub-carrierk on the symbol 1 of an antenna port p according to the followingexpression:

$a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime}} + N_{RB}^{\max,{DL}}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)}} & {{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 0}} \\{{- s} \cdot {r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)}} & {{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 1}}\end{matrix} \right.$

wherein,

a_(k,l) ^((p)) refers to a location of the sub-carrier k on the symbol lof the antenna port p;

k=5·m′+N _(sc) ^(RB) ·n _(PRB)+1, or k=5·m′+N _(sc) ^(RB)·n_(PRB);

s=(−1)^(n) ^(PRB) ^(+l′+m′), or s=(−1)^(n) ^(PRB) ^(+l′+m′+n) ^(s) , ors=(−1)^(n) ^(PRB) ^(+l′+m′+└l′/2┘), or s=(−1)^(l′);

m′=0, 1 or 2;

n_(PRB) refers to an index of a physical RB allocated by the system;

N_(sc) ^(RB) refers to a number of sub-carriers contained in the RB.

In order to solve the aforementioned technical problem, the presentinvention further provides a system for mapping a reference signalsequence in an advanced long term evolution system, which is used to mapthe reference signal sequence to an orthogonal frequency divisionmultiplexing symbol l, comprising a mapping module,

the mapping module is configured to determine the symbol l according tothe following expression when the system uses a normal cyclic prefix:

$l = \left\{ {{\begin{matrix}\left. {{l^{\prime}{mod}\; 2} + 2 + {3 \cdot \left\lfloor {l^{\prime}/2} \right\rfloor}} \right) & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\{{l^{\prime}{mod}\; 2} + 2} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 3},{4\mspace{14mu} {or}\mspace{14mu} 8}} \\{{l^{\prime}{mod}\; 2} + 5} & {{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a\mspace{14mu} {non}\text{-}} \\\; & {{special}\mspace{14mu} {subframe}}\end{matrix}l^{\prime}} = \left\{ \begin{matrix}\; & {{{{n_{s}\mspace{14mu} {mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\{0,1,2,3} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {1,2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}\mspace{14mu} {mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}}}\mspace{14mu}} \\\; & {{a\mspace{14mu} {special}\mspace{14mu} {subframe}},} \\{0,1} & {{{or}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {{{not}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}\mspace{14mu} {mod}\; 2} = 1},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}}}\mspace{14mu}} \\\; & {{a\mspace{14mu} {special}\mspace{14mu} {subframe}},} \\{2,3} & {{{or}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {{{not}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}}\end{matrix} \right.} \right.$

wherein,

n_(s) is an index of a time slot in a radio frame.

Preferably, the system further comprises a first acquiring module and asecond acquiring module, wherein,

the first acquiring module is configured to acquire the index n_(PRB) ofthe physical RB allocated by the system;

the second acquiring module is configured to the number N_(sc) ^(RB) ofthe sub-carriers contained in the RB;

wherein,

the mapping module is further configured to map the reference signalsequence to a location a_(k,l) ^((p)) of a sub-carrier k on the symbol lof an antenna port p according to the index n_(PRB) of the physical RB,the number N_(sc) ^(RB) of the sub-carriers and the followingexpression:

$a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)}} & {{{{when}\mspace{14mu} p} = 8},}\end{matrix} \right.$

wherein, k=5·m′+N_(sc) ^(RB)·n_(PRB)+1, or k=5·m′+N_(sc) ^(RB) ·n_(PRB);

s=(−1)^(n) ^(PRB) ^(+l′+m′), or s=(−1)^(n) ^(PRB) ^(+l′+m′+n) ^(s) , ors=(−1)^(n) ^(PRB) ^(+l′+m′+└l′/2┘), or s=(−1)^(l′);

m′=0, 1 or 2;

alternatively.

$a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)}} & {{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 0}} \\{{- s} \cdot {r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)}} & {{{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 1}},}\end{matrix} \right.$

wherein, s=(−1)^(n) ^(PRB) ^(+m′), or s=(−1)^(n) ^(PRB) ^(+m′+n) ^(s) ,or s=(−1)^(n) ^(PRB) ^(+m′+└l′/2┘), or s=1; alternatively,

$a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)}} & {{{{when}\mspace{14mu} p} = 8},}\end{matrix} \right.$

wherein, s=(−1)^(n) ^(PRB) ^(+l′+m′), or s=(−1)^(n) ^(PRB) ^(+l′+m′+n)^(s) , or s=(−1)^(n) ^(PRB) ^(+l′+m′+└l′/2┘), or s=(−1)^(l′);alternatively,

$a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)}} & {{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 0}} \\{{- s} \cdot {r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)}} & {{{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 1}},}\end{matrix} \right.$

wherein, s=(−1)^(n) ^(PRB) ^(+m′), or s=(−1)^(n) ^(PRB) ^(+m′+n) ^(s) ,or s=(−1)^(n) ^(PRB) ^(+m′+└l′/2┘), or s=(−1)^(l′);

The special subframe is a subframe containing DwPTS time slots.

The system and the method according to the present invention ensure thetransmission performance while ensuring the interference randomization.In addition, the system and the method are well compatible with existingLTE systems, thus realizing the high-order MIMO transmission, supportingthe usage of the corresponding techniques, and improving the entireperformance of the system.

Other features and advantages of the present invention will be set forthin the subsequent specification, and can be obviously seen from thespecification partly, or can be understood from embodiments. The purposeand other advantages of the present invention can be implemented andobtained through the structure especially indicated in thespecification, claims and accompanying drawings.

BRIEF DESCRIPTION OF DRAWINGS

Accompanying drawings are used to provide further understanding of thepresent invention, and constitute a part of the specification; and theaccompanying drawings are only used to explain the present invention incombination with embodiments of the present invention, rather thanlimiting the present invention. In the accompanying drawings:

FIG. 1( a) is a diagram of a frame structure for a FDD mode of a LTEsystem;

FIG. 1( b) is a diagram of a frame structure for a TDD mode of a LTEsystem;

FIG. 2 is a diagram of a physical RB of a LTE system with a systembandwidth of 5 MHz;

FIG. 3( a) is a diagram of locations of common reference signals in aphysical RB for a normal CP;

FIG. 3( b) is a diagram of locations of common reference signals in aphysical RB for an extended CP;

FIG. 4( a) is a diagram of a location of layer 1 of two layer referencesignals in a physical RB for a normal CP;

FIG. 4( b) is a diagram of a location of layer 2 of two layer referencesignals in a physical RB for a normal CP;

FIG. 5 is a diagram of a composition of an embodiment of a generatingsystem in accordance with the present invention; and

FIG. 6 is a diagram of a composition of an embodiment of a mappingsystem in accordance with the present invention.

PREFERRED EMBODIMENTS OF THE PRESENT INVENTION

The implementation of the present invention will be illustrated infurther detail in combination with accompanying drawings and embodimentshereinafter, and thus being able to fully understand and carry out theimplementation process of how to apply a technique to solve a technicalproblem and to achieve a technical effect.

It should be illustrated that, if there is no conflict, the embodimentsof the present invention and each feature in the embodiments can becombined with each other, and should belong to the scope of the presentinvention. In addition, steps shown in flow charts of the accompanyingdrawings can be performed in a computer system with a set of computerexecutable instructions for example; and although logical orders areshown in the flow charts, in some cases, the steps shown or describedcan be performed in a different order from those here.

In a method for transmitting reference signals for a LTE-Advanced systemproposed in the present invention, the reference signal corresponding toeach layer is respectively denoted as reference signal #0 of layer 1 andreference signal #1 of layer 2, and each reference signal is transmittedon respective layer.

In the method according to the present invention, a number of layers fortransmitting reference signals is two, and the layers transmit thereference signal #0 and the reference signal #1 respectively.

The reference signal #0 is located on the 1^(st), 6^(th) and 11^(th)sub-carries of the penultimate symbol and the 1^(st), 6^(th) and 11^(th)sub-carries of the last symbol of the 1^(st) time slot, and the 1^(st),6^(th) and 11^(th) sub-carries of the penultimate symbol and the 1^(st),6^(th) and 11^(th) sub-carries of the last symbol of the 2^(nd) timeslot, in a subframe; and the corresponding orthogonal codes are {1, 1}.

The reference signal #1 is located on the 1^(st), 6 ^(th) and 11^(th)sub-carries of the penultimate symbol and the 1^(st), 6 ^(th) and11^(th) sub-carries of the last symbol of the 2^(nd) time slot, and the1^(st), 6^(th) and 11^(th) sub-carries of the penultimate symbol and the1^(st), 6^(th) and 11^(th) sub-carries of the last symbol, of the 2^(nd)time slot, in a subframe; and the corresponding orthogonal codes are oneor two of {1, −1} and {−1, 1}.

Alternatively,

The reference signal #0 is located on the 2^(nd), 7^(th) and 12^(th)sub-carries of the penultimate symbol and the 2^(nd), 7 ^(th) and12^(th) sub-carries of the last symbol of the 1^(st) time slot and the2^(nd), 7^(th) and 12^(th) sub-carries of the penultimate symbol and the2^(nd), 7^(th) and 12^(th) sub-carries of the last symbol, of the 2^(nd)time slot, in a subframe; and the corresponding orthogonal codes are {1,1}.

The reference signal #1 is located on the 2^(nd), 7^(th) and 12^(th)sub-carries of the penultimate symbol and the 2^(nd), 7^(th) and 12^(th)sub-carries of the last symbol of the 2^(nd) time slot, and the 2^(nd),7^(th) and 12^(th) sub-carries of the penultimate symbol and the 2^(nd),7^(th) and 12^(th) sub-carries of the last symbol of the 2^(nd) timeslot, in a subframe; and the corresponding orthogonal codes are one ortwo of {1, −1} and {−1, 1}.

A reference signal occupies three sub-carriers on an OFDM symbol in aphysical RB.

FIG. 4( a) and FIG. 4( b) illustrate specific carrier locations ofreference signals based on layers in the corresponding RB thereof, inaccordance with the method of the present invention in the firstembodiment and the second embodiment.

Label T₁ and T₂ in FIG. 4( a) and FIG. 4( b) correspond to referencesignal #0 of layer 1 and reference signal #1 of layer 2 respectively.

Embodiment One

The reference signals are only transmitted on locations in thetime-frequency domain where a user-specific PDSH is. The antenna port(layer) number is p (p=7, 8), and then the method for generating andmapping reference signals of the antenna port 7 and the antenna port 8is as follows.

The reference signal sequence r(m) is generated according to thefollowing expression:

$\begin{matrix}{{{r( m)} = {{\frac{1}{\sqrt{2}} \left( {1 - {2 \cdot {c\left( {2 m} \right)}}} \right)} + {j \frac{1}{\sqrt{2}} \left( {1 - {2 \cdot {c\left( {{2 m} + 1} \right)}}} \right)}}},{m = 0},1,\ldots \mspace{14mu},{L - 1}} & {{Formula}\mspace{14mu} (1)}\end{matrix}$

wherein,

L is a sequence length required by the reference signals.

The pseudo-random sequence c(i) is generated according to the followingexpression:

c(i)=(x _(i)(i+N _(C))+x ₂(i+N _(C)))mod 2   Formula (2)

x ₁(i+31)=(x ₁(i+3)+x ₁(i))mod 2   Formula (3)

x ₂(i+31)=(x ₂(i+3)+x ₂(i+2)+x ₂(i+1)+x ₂(i))mod 2   Formula (4)

wherein,

N_(C)=1600;

x₁(0)=1, x₁(n)=0, n=1, 2, . . . , 30;

x₂ is generated from the expression of c_(init)=Σ_(n=0) ³⁰ x₂(n)·2^(n)according to an initial value of the pseudo-random sequence.

The value of c_(init) is as follows:

c _(init)=(└n _(s)/2┘+1)·(2N _(ID) ^(cell)+1)·2¹⁶ n _(SCID)   Formula(5)

wherein,

n_(s) is an index of a time slot in a radio frame;

N_(ID) ^(cell) is a cell identifier;

└x┘ refers to an operation of rounding down; and

the value of n_(SCID) is 0 or 1, and is determined according tosignaling.

L is the maximum system bandwidth N_(RB) ^(max,DL), and the specificmode for mapping the sequence to the sub-carrier k on the time domainOFDM symbol l of the antenna port p is as follows.

When the system uses the normal Cyclic Prefix,

$\begin{matrix}{a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)}} & {{{when}\mspace{14mu} p} = 8}\end{matrix} \right.} & {{Formula}\mspace{14mu} (6)}\end{matrix}$

wherein,

a_(k,l) ^((p)) refers to a location of the sub-carrier k on the timedomain OFDM symbol l of the antenna port p.

k = 5 ⋅ m^(′) + N_(sc)^(RB) ⋅ n_(PRB) + 1;s = (−1)^(n_(PRB) + l^(′) + m^(′)); $l = \left\{ {\begin{matrix}\left. {{l^{\prime}{mod}\; 2} + 2 + {3 \cdot \left\lfloor {l^{\prime}/2} \right\rfloor}} \right) & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {the}}\mspace{14mu}} \\\; & {{{DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\{{l^{\prime}{mod}\; 2} + 2} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {the}}\mspace{14mu}} \\\; & {{{DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{11mu}} \\\; & {\; {{{subframe}\mspace{14mu} {is}\mspace{14mu} 3},{4\mspace{14mu} {or}\mspace{14mu} 8}}} \\{{l^{\prime}{mod}\; 2} + 5} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {not}\mspace{14mu} {the}}\mspace{14mu}} \\\; & {{DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}}\end{matrix};{l^{\prime} = \left\{ \begin{matrix}\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {the}}}\mspace{14mu}} \\\; & {{{DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\{0,1,2,3} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}}\mspace{14mu}} \\\; & {{{is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {not}}}\mspace{14mu}} \\\; & {{{the}\mspace{14mu} {DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\{0,1} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}}\mspace{14mu}} \\\; & {{{is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 1},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {not}}}\mspace{14mu}} \\\; & {{{the}\mspace{14mu} {DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\{2,3} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}}\mspace{14mu}} \\\; & {{{is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}}\end{matrix} \right.}} \right.$

That is,

$l = \left\{ {\begin{matrix}\left. {{l^{\prime}{mod}\; 2} + 2 + {3 \cdot \left\lfloor {l^{\prime}/2} \right\rfloor}} \right) & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\{{l^{\prime}{mod}\; 2} + 2} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 3},{4\mspace{14mu} {or}\mspace{14mu} 8}} \\{{l^{\prime}{mod}\; 2} + 5} & {{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a\mspace{14mu} {non}\text{-}} \\\; & {{special}\mspace{14mu} {subframe}}\end{matrix};{l^{\prime} = \left\{ {{{\begin{matrix}\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\{0,1,2,3} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}}\mspace{14mu}} \\\; & {{{is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}}}\mspace{14mu}} \\\; & {{a\mspace{14mu} {special}\mspace{14mu} {subframe}},} \\{0,1} & {{{or}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {{{not}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 1},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}}}\mspace{14mu}} \\\; & {{a\mspace{14mu} {special}\mspace{14mu} {subframe}},} \\{2,3} & {{{or}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {{{not}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}}\end{matrix}m^{\prime}} = 0},{{1\mspace{14mu} {or}\mspace{14mu} 2};}} \right.}} \right.$

wherein, the special subframe is a subframe containing DwPTS time slots;

n_(PRB) refers to an index of a physical RB allocated by the system;

N_(sc) ^(RB) refers to a number of sub-carriers contained in the RB.

The orthogonal sequence index S in the aforementioned expression canalso be s=(−1)^(n) ^(PRB) ^(+l′+m′n) _(s), or s=(−1)^(n) ^(PRB)^(+l′+m′+└l′/2┘), or s=(−1)^(l′); and the sub-carrier index k can alsobe k=5·m′+N_(sc) ^(RB)·n_(PRB); alternatively,

$\begin{matrix}{a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{12 \cdot n_{prb}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)}} & {{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 0}} \\{{- s} \cdot {r\left( {{12 \cdot n_{prb}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)}} & {{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 1}}\end{matrix} \right.} & {{Formula}\mspace{14mu} (7)}\end{matrix}$

wherein,

a_(k,l) ^((p)) refers to a location of the sub-carrier k on the timedomain OFDM symbol l of the antenna port p.

k = 5 ⋅ m^(′) + N_(sc)^(RB) ⋅ n_(PRB) + 1; s = (−1)^(n_(PRB) + m^(′));$l = \left\{ {\begin{matrix}{{l^{\prime}{mod}\; 2} + 2 + {3 \cdot \left\lfloor {l^{\prime}/2} \right\rfloor}} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {the}}\mspace{14mu}} \\\; & {{{DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\{{l^{\prime}{mod}\; 2} + 2} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {the}}\mspace{14mu}} \\\; & {{{DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 3},{4\mspace{14mu} {or}\mspace{14mu} 8}} \\{{l^{\prime}{mod}\; 2} + 5} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {not}\mspace{14mu} {the}}\mspace{14mu}} \\\; & {{DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}}\end{matrix};{l^{\prime} = \left\{ {{\begin{matrix}\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {the}}}\mspace{14mu}} \\\; & {{{DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\{0,1,2,3} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {1,2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {not}}}\mspace{14mu}} \\\; & {{{the}\mspace{14mu} {DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\{0,1} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {1,2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 1},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {not}\mspace{14mu} {the}}}\mspace{14mu}} \\\; & {{{DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\{2,3} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {1,2,{6\mspace{14mu} {or}\mspace{14mu} 7}}\end{matrix};{{That}\mspace{14mu} {is}}},{l = \left\{ {\begin{matrix}\left. {{l^{\prime}{mod}\; 2} + 2 + {3 \cdot \left\lfloor {l^{\prime}/2} \right\rfloor}} \right) & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\\; & {{{and}\mspace{14mu} {the}\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {current}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\{{l^{\prime}{mod}\; 2} + 2} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\\; & {{{and}\mspace{14mu} {the}\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {current}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 3},{4\mspace{14mu} {or}\mspace{14mu} 8}} \\{{l^{\prime}{mod}\; 2} + 5} & {{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a\mspace{14mu} {non}\text{-}} \\\; & {{special}\mspace{14mu} {subframe}}\end{matrix};{l^{\prime} = \left\{ {{\begin{matrix}\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\{0,1,2,3} & {{{and}\mspace{14mu} {the}\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {1,2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}\mspace{14mu} a}}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\{0,1} & {{{or}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}}\mspace{14mu}} \\\; & {1,2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 1},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}\mspace{14mu} a}}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\{2,3} & {{{or}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}}\mspace{14mu}} \\\; & {1,2,{6\mspace{14mu} {or}\mspace{14mu} 7}}\end{matrix};{{{and}m^{\prime}} = 0}},{{1\mspace{14mu} {or}\mspace{14mu} 2};}} \right.}} \right.}} \right.}} \right.$

wherein, the special subframe is a subframe containing DwPTS time slots;

n_(PRB) refers to an index of a physical RB allocated by the system;

N_(sc) ^(RB) refers to a number of sub-carriers contained in the RB.

The orthogonal sequence index s in the aforementioned expression canalso be s=(−1)^(n) ^(PRB) ^(+m′n) _(s), or s=(−1)^(n) ^(PRB)^(+m′+└l′/2┘), or s=1; and the sub-carrier index k can also bek=5·m′+N_(sc) ^(RB)·n_(PRB).

Embodiment Two

The reference signals are only transmitted on locations in thetime-frequency domain where a user-specific PDSH is. The antenna port(layer) number is p (p=7, 8), and then the specific mode for generatingand mapping reference signals of the antenna port 7 and the antenna port8 is as follows.

The reference signal sequence r(m) is generated according to the Formula(1) to Formula (5).

L is the maximum system bandwidth N_(RB) ^(max,D), the specific methodfor mapping the sequence to the sub-carrier k on the time domain OFDMsymbol l of the antenna port p, is as follows.

When the system uses the normal CP:

$\begin{matrix}{a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)}} & {{{when}\mspace{14mu} p} = 8}\end{matrix} \right.} & {{Formula}\mspace{14mu} (8)}\end{matrix}$

wherein,

a_(k,l) ^((p)) refers to a location of the sub-carrier k on the timedomain OFDM symbol l of the antenna portp .

k = 5 ⋅ m^(′) + N_(sc)^(RB) ⋅ n_(PRB) + 1;s = (−1)^(n_(PRB) + l^(′) + m^(′)); $l = \left\{ {\begin{matrix}\left. {{l^{\prime}{mod}\; 2} + 2 + {3 \cdot \left\lfloor {l^{\prime}/2} \right\rfloor}} \right) & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {the}}\mspace{14mu}} \\\; & {{{DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\{{l^{\prime}{mod}\; 2} + 2} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {the}}\mspace{14mu}} \\\; & {{{DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 3},{4\mspace{14mu} {or}\mspace{14mu} 8}} \\{{l^{\prime}{mod}\; 2} + 5} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {not}\mspace{14mu} {the}}\mspace{14mu}} \\\; & {{DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}}\end{matrix};{l^{\prime} = \left\{ {{\begin{matrix}\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {the}}}\mspace{14mu}} \\\; & {{{DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\{0,1,2,3} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}}\mspace{14mu}} \\\; & {{{is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {not}}}\mspace{14mu}} \\\; & {{{the}\mspace{14mu} {DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\{0,1} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}}\mspace{14mu}} \\\; & {{{is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 1},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {not}}}\mspace{14mu}} \\\; & {{{the}\mspace{14mu} {DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\{2,3} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}}\mspace{14mu}} \\\; & {{{is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}}\end{matrix}{That}\mspace{14mu} {is}},{l = \left\{ {\begin{matrix}\left. {{l^{\prime}{mod}\; 2} + 2 + {3 \cdot \left\lfloor {l^{\prime}/2} \right\rfloor}} \right) & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\{{l^{\prime}{mod}\; 2} + 2} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 3},{4\mspace{14mu} {or}\mspace{14mu} 8}} \\{{l^{\prime}{mod}\; 2} + 5} & {{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a\mspace{14mu} {non}\text{-}} \\\; & {{special}\mspace{14mu} {subframe}}\end{matrix};{l^{\prime} = \left\{ {{\begin{matrix}\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\{0,1,2,3} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {1,2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}\mspace{14mu} a}}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\{0,1} & {{{or}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}}\mspace{14mu}} \\\; & {1,2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 1},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}\mspace{14mu} a}}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\{2,3} & {{{or}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}}\mspace{14mu}} \\\; & {1,2,{6\mspace{14mu} {or}\mspace{14mu} 7}}\end{matrix};{m^{\prime} = 0}},{{1\mspace{14mu} {or}\mspace{14mu} 2};}} \right.}} \right.}} \right.}} \right.$

wherein, the special subframe is a subframe containing DwPTS time slots;

n_(PRB) refers to an index of a physical RB allocated by the system;

N_(sc) ^(RB) refers to a number of sub-carriers contained in the RB. Theorthogonal sequence index s in the aforementioned expression can also bes=(−1)^(n) ^(PRB) ^(+l′+m′n) _(s), or s=(−1)^(n) ^(PRB)^(+l′+m′+└l′/2┘), or s=(−1)^(l′); and the sub-carrier index k can alsobe k=5·m′+N_(sc) ^(RB)·n_(PRB);

alternatively,

$\begin{matrix}{a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)}} & {{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 0}} \\{{- s} \cdot {r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)}} & {{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 1}}\end{matrix} \right.} & {{Formula}\mspace{14mu} (9)}\end{matrix}$

wherein,

a_(k,l) ^((p)) refers to a location of the sub-carrier k on the timedomain OFDM symbol l of the antenna port p.

k = 5 ⋅ m^(′) + N_(sc)^(RB) ⋅ n_(PRB) + 1; s = (−1)^(n_(PRB) + m^(′));$l = \left\{ {\begin{matrix}{{l^{\prime}{mod}\; 2} + 2 + {3 \cdot \left\lfloor {l^{\prime}/2} \right\rfloor}} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {the}}\mspace{14mu}} \\\square & {{{DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\square & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\{{l^{\prime}{mod}\; 2} + 2} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {the}}\mspace{14mu}} \\\square & {{{DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\square & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 3},{4\mspace{14mu} {or}\mspace{14mu} 8}} \\{{l^{\prime}{mod}\; 2} + 5} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {not}\mspace{14mu} {the}}\mspace{14mu}} \\\square & {{DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}}\end{matrix};{l^{\prime} = \left\{ {{\begin{matrix}\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {the}}}\mspace{14mu}} \\\square & {{{DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\{0,1,2,3} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}}\mspace{14mu}} \\\square & {{{is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {not}}}\mspace{14mu}} \\\square & {{{the}\mspace{14mu} {DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\{0,1} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}}\mspace{14mu}} \\\square & {{{is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 1},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}\mspace{14mu} {not}}}\mspace{14mu}} \\\square & {{{the}\mspace{14mu} {DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\{2,3} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}}\mspace{14mu}} \\\square & {{{is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}}\end{matrix};{{That}\mspace{14mu} {is}}},{l = \left\{ {\begin{matrix}\left. {{l^{\prime}{mod}\; 2} + 2 + {3 \cdot \left\lfloor {l^{\prime}/2} \right\rfloor}} \right) & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}\mspace{14mu}} \\\square & {{{special}\mspace{14mu} {subframe}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\square & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\{{l^{\prime}{mod}\; 2} + 2} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}\mspace{14mu}} \\\square & {{{special}\mspace{14mu} {subframe}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\square & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 3},{4\mspace{14mu} {or}\mspace{14mu} 8}} \\{{l^{\prime}{mod}\; 2} + 5} & {{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a\mspace{14mu} {non}\text{-}} \\\square & {{special}\mspace{14mu} {subframe}}\end{matrix};{l^{\prime} = \left\{ {{\begin{matrix}\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}}\mspace{14mu}} \\\square & \square \\{0,1,2,3} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}}\mspace{11mu}} \\\square & {\; {{{is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}}} \\\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}}}\mspace{14mu}} \\\square & {{a\mspace{14mu} {special}\mspace{14mu} {subframe}},} \\{0,1} & {{{or}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\square & {{{not}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 1},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}}}\mspace{14mu}} \\\square & {{{not}\mspace{14mu} a\mspace{14mu} {special}\mspace{14mu} {subframe}},} \\{2,3} & {{{or}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\square & {{{not}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}}\end{matrix};{{{and}m^{\prime}} = 0}},{{1\mspace{14mu} {or}\mspace{14mu} 2};}} \right.}} \right.}} \right.}} \right.$

wherein, the special subframe is a subframe containing DwPTS time slots;

n_(PRB) refers to an index of a physical RB allocated by the system;

N_(sc) ^(RB) refers to a number of sub-carriers contained in the RB.

The orthogonal sequence index s in the aforementioned expression canalso be s=(−1)^(n) ^(PRB) ^(+m′n) _(s), or s=(−1)^(n) ^(PRB)^(+m′+└l′/2┘), or s=1; and the sub-carrier index k can also bek=5·m′+N_(sc) ^(RB)n_(PRB).

FIG. 5 is a diagram of a composition of an embodiment of a generatingsystem in accordance with the present invention, and the embodiment ofthe generating system is used to generate reference signal sequences ofthe antenna port 7 and the antenna port 8. As shown in FIG. 5, theembodiment of the generating system primarily comprises a firstgenerator 510 and a second generator 520.

Wherein, the first generator 510 is used to generate a pseudo-randomsequence c(i) according to the following expression:

c(i)=(x ₁(i+N _(C))+x ₂(i+N _(C)))mod 2;

x ₁(i+31)=(x ₁(i+3)+x ₁(i))mod 2;

x ₂(i+31)=(x ₂(i+3)+x ₂(i+2)+x ₂(i+1)+x ₂(i))mod 2;

wherein,

N_(C)=1600;

x₁(0)=1, x₁(n)=0, n=1, 2, . . . , 30;

x₂ is generated from the expression of C_(init)=Σ_(n=0) ³⁰ x₂(n)·2^(n)according to an initial value of the pseudo-random sequence.

c_(init)=(└n_(s)/2┘+1)·2¹⁶ +n _(SCID);

wherein,

n_(s) is an index of a time slot in a radio frame;

N_(ID) ^(cell) is a cell identifier;

└x┘ refers to an operation of rounding down; and

the value of n_(SCID) is 0 or 1, and is determined according tosignaling.

The second generator 520 is connected with the first generator 510, andis used to generate a reference signal sequence r(m) according to thepseudo-random sequence c(i) and the following expression:

${{r(m)} = {{\frac{1}{\sqrt{2}}\left( {1 - {2 \cdot {c\left( {2m} \right)}}} \right)} + {j\frac{1}{\sqrt{2}}\left( {1 - {2 \cdot {c\left( {{2m} + 1} \right)}}} \right)}}},{m = 0},1,\ldots \mspace{14mu},{{L - 1};}$

wherein, L is the maximum system bandwidth.

As shown in FIG. 5, the first generator 510 comprises a first parametergeneration module 511 and a second parameter generation module 512.

Wherein, the first parameter generation module 511 is connected with thesecond generator 520 and is used to generate a first parameterx_(1 according to the expression of x) ₁(i+31)=(x₁(i+3)+x₁(i))mod 2,wherein, x₁(0)=1, x₁(n)=0, n=1, 2, . . . ,30 .

The second parameter generation module 512 is connected with the secondgenerator 520, and is used to generate a second parameterx_(2 from the expression of c) _(init)=Σ_(n=0) ³⁰ x₂(n)·2^(n) accordingto an initial value of the pseudo-random sequence, wherein,

c _(init)=(└n _(s)/2┘+1)·(2N _(ID) ^(cell)+1)·2¹⁶ +n _(SCID),

wherein,

n_(s) is an index of a time slot in a radio frame;

N_(ID) ^(cell) is a cell identifier;

└x┘ refers to an operation of rounding down; and

The value of n_(SCID) is 0 or 1, and is determined according tosignaling.

FIG. 6 is a diagram of a composition of an embodiment of a mappingsystem in accordance with the present invention, and the mapping systemis used to map a reference signal sequence. As shown in FIG. 6, themapping system mainly comprises a first acquiring module 610, a secondacquiring module 620 and a mapping module 630.

The first acquiring module 610 is configured to acquire an index n_(PRB)of a physical RB allocated by the system.

The second acquiring module 620 is configured to acquire a number N_(sc)^(RB) of sub-carriers contained in the RB.

The mapping module 630 is connected with the first acquiring module 610and the second acquiring module 620, and is configured to map thereference signal sequence to a location a_(k,l) ^((p)) of thesub-carrier k on the time domain OFDM symbol l of the antenna port p,according to the index n_(PRB) of the physical RB, the number N_(sc)^(RB) of the sub-carriers and the following expression, when the systemuses the normal CP.

$a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)}} & {{{when}\mspace{14mu} p} = 8}\end{matrix} \right.$

wherein,

k = 5 ⋅ m^(′) + N_(sc)^(RB) ⋅ n_(PRB) + 1, ork = 5 ⋅ m^(′) + N_(sc)^(RB) ⋅ n_(PRB);s = (−1)^(n_(PRB) + l^(′) + m^(′)), ors = (−1)^(n_(PRB) + l^(′) + m^(′) + n_(s)), ors = (−1)^(n_(PRB) + l^(′) + m^(′) + ⌊l^(′)/2⌋), or s = (−1)^(l^(′));$l = \left\{ {{\begin{matrix}\left. {{l^{\prime}{mod}\; 2} + 2 + {3 \cdot \left\lfloor {l^{\prime}/2} \right\rfloor}} \right) & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}}\mspace{14mu}} \\\; & {{{is}\mspace{14mu} {the}\mspace{14mu} {DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\\; & {{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}} \\\square & {{{the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {1,2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\{{l^{\prime}{mod}\; 2} + 2} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}}\mspace{14mu}} \\\; & {{{is}\mspace{14mu} {the}\mspace{14mu} {DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\\; & {{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}} \\\; & {{{the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {3,{4\mspace{14mu} {or}\mspace{14mu} 8}} \\{{l^{\prime}{mod}\; 2} + 5} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}}\mspace{14mu}} \\\; & {{is}\mspace{14mu} {not}\mspace{14mu} {the}\mspace{14mu} {DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}}\end{matrix}l^{\prime}} = \left\{ \begin{matrix}\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}}}\mspace{14mu}} \\\; & {{{the}\mspace{14mu} {DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\{0,1,2,3} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}}}\mspace{14mu}} \\\; & {{{not}\mspace{14mu} {the}\mspace{14mu} {DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\0.1 & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 1},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {scence}\mspace{14mu} {is}}}\mspace{14mu}} \\\; & {{{not}\mspace{14mu} {the}\mspace{14mu} {DwPTS}\mspace{14mu} {time}\mspace{14mu} {slot}},} \\{2,3} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}}\end{matrix} \right.} \right.$

that is,

$l = \left\{ {\begin{matrix}\left. {{l^{\prime}{mod}\; 2} + 2 + {3 \cdot \left\lfloor {l^{\prime}/2} \right\rfloor}} \right) & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {{a\mspace{14mu} {special}\mspace{14mu} {subframe}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\{{l^{\prime}{mod}\; 2} + 2} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 3},{4\mspace{14mu} {or}\mspace{14mu} 8}} \\{{l^{\prime}{mod}\; 2} + 5} & {{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a\mspace{14mu} {non}\text{-}} \\\; & {{special}\mspace{14mu} {subframe}}\end{matrix};{l^{\prime} = \left\{ \begin{matrix}\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}}}\mspace{14mu}} \\\; & {{a\mspace{14mu} {special}\mspace{14mu} {subframe}},} \\{0,1,2,3} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {1,2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}}} \\\; & {{a\mspace{14mu} {special}\mspace{14mu} {subframe}},} \\0.1 & {{{or}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {{{not}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 1},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}}}\mspace{14mu}} \\\; & {{a\mspace{14mu} {special}\mspace{14mu} {subframe}},} \\{2,3} & {{{or}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {{{not}\mspace{14mu} 1},2,{{6\mspace{14mu} {or}\mspace{14mu} 7};}}\end{matrix} \right.}} \right.$

the special subframe is a subframe containing DwPTS time slots;

m′=0, 1 or 2.

alternatively,

the mapping module 630 maps the reference signal sequence to a_(k,l)^((p)) according to the index n_(PRB) of the physical RB, the numberN_(sc) ^(RB) of the sub-carriers and the following expression:

$a_{k,l}^{(p)} = \left\{ {\begin{matrix}{r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)}} & {{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 0}} \\{{- s} \cdot {r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)}} & {{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 1}}\end{matrix},} \right.$

-   -   wherein, s=(−1)^(n) ^(PRB) ^(+m′), or s=(−1)^(n) ^(PRB) ^(+m′+n)        _(s), or s=(−1)^(n) ^(PRB) ^(+m′+└l′/2┘), or s=1:

alternatively,

the mapping module 630 maps the reference signal sequence to a_(k,l)^((p)) according to the index n_(PRB) of the physical RB, the numberN_(sc) ^(RB) of the sub-carriers and the following expression:

$a_{k,l}^{(p)} = \left\{ {\begin{matrix}{r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot n_{RB}^{\max,{DL}}}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)}} & {{{when}\mspace{14mu} p} = 8}\end{matrix},} \right.$

-   -   wherein, s=(−1)^(n) ^(PRB) ^(+l′+m′), or s=(−1)^(n) ^(PRB)        ^(+l′+m′+n) _(s), or s=(−1)^(n) ^(PRB) ^(+l′+m′+└l′/2┘), or        s=(−1)^(l′;)

alternatively

the mapping module 630 maps the reference signal sequence to a_(k,l)^((p)), according to the index n_(PRB) of the physical RB, the numberN_(sc) ^(RB) of the sub-carriers and the following expression:

$a_{k,l}^{(p)} = \left\{ {\begin{matrix}{r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)}} & {{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 0}} \\{{- s} \cdot {r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)}} & {{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 1}}\end{matrix},} \right.$

-   -   wherein, s=(−1)^(n) ^(PRB) ^(+m′), or s=(−1)^(n) ^(PRB) ^(+m′+n)        _(s), or s=(−1)^(n) ^(PRB) ^(+m′+└l′/2┘), or s=1;

Obviously, those skilled in the art should understand that each moduleor each step of the aforementioned present invention can be implementedwith general computing devices, and can be integrated in a singlecomputing device, or distributed onto a network consisting of aplurality of computing devices; alternatively, they can be implementedwith program codes executable by the computing devices, and therefore,they can be stored in storage devices to be executed by the computingdevices; alternatively, they are respectively made into a plurality ofintegrated circuit modules; alternatively, it is implemented with makingseveral modules or steps of them into a single integrated circuitmodule. Thus, the present invention is not limited to any specificcombinations of hardware and software.

Although the embodiments of the present invention are disclosed above,the disclosure is only the embodiments adopted to facilitateunderstanding of the present invention, and is not intended to limit thepresent invention. For those skilled in any technical art to which thepresent invention belongs, any modification or change can be made informs and details of implementation without departing from the spiritand scope of the present invention; however, the patent protection scopeof the present invention shall comply with the scope defined in theappended claims.

INDUSTRIAL APPLICABILITY

Compared with the prior art, the system and the method according to thepresent invention ensure the transmission performance while ensuring theinterference randomization. In addition, the system and the method arewell compatible with existing LTE systems, thus realizing the high-orderMIMO transmission, supporting the usage of the corresponding techniques,and improving the entire performance of the system.

1. A method for mapping a reference signal sequence in an advanced longterm evolution system, which is used to map the reference signalsequence to an orthogonal frequency division multiplexing symbol l,comprising: determining the symbol l according to following expressionswhen the system uses a normal cyclic prefix:$l = \left\{ {{\begin{matrix}\left. {{l^{\prime}{mod}\; 2} + 2 + {3 \cdot \left\lfloor {l^{\prime}/2} \right\rfloor}} \right) & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\{{l^{\prime}{mod}\; 2} + 2} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 3},{4\mspace{14mu} {or}\mspace{14mu} 8}} \\{{l^{\prime}{mod}\; 2} + 5} & {{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a\mspace{14mu} {non}\text{-}} \\\; & {{special}\mspace{14mu} {subframe}}\end{matrix}l^{\prime}} = \left\{ \begin{matrix}\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\{0,1,2,3} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {1,2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}}}\mspace{14mu}} \\\; & {{a\mspace{14mu} {special}\mspace{14mu} {subframe}},} \\0.1 & {{{or}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {{{not}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 1},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}}}\mspace{14mu}} \\\; & {{a\mspace{14mu} {special}\mspace{14mu} {subframe}},} \\{2,3} & {{{or}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {{{not}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}}\end{matrix} \right.} \right.$ wherein, n_(s) is an index of a time slotin a radio frame.
 2. The method of claim 1, further comprising mappingthe reference signal sequence to a location a_(k,l) ^((p)) of asub-carrier k on the symbol l of an antenna port p according to afollowing expression: $a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)}} & {{{when}\mspace{14mu} p} = 8}\end{matrix} \right.$ wherein, a_(k,l) ^((p)) pefers to a location ofthe sub-carrier k on the symbol l of the antenna port p;k=5·m′+N _(sc) ^(RB) ·n _(PRB)+1, or k=5·m′+N _(sc) ^(RB) ·n _(PRB);s=(−1)^(n) ^(PRB) ^(+l′+m′), or s=(−1)^(n) ^(PRB) ^(+l′+m′+n) ^(s) , ors=(−1)^(n) ^(PRB) ^(+l′+m′+└l′/2┘), or s=(−1)^(l′); m′=0, 1 or 2;n_(PRB) refers to an index of a physical RB allocated by the system;N_(sc) ^(RB) refers to a number of sub-carriers contained in one RB. 3.The method of claim 1, further comprising mapping the reference signalsequence to a location a_(k,l) ^((p)) of a sub-carrier k on the symbol lof an antenna port p according to a following expression:$a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}}\; \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)}} & {{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 0}} \\{{- s} \cdot {r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)}} & {{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 1}}\end{matrix} \right.$ wherein, a_(k,l) ^((p)) refers to a location ofthe sub-carrier k on the symbol l of the antenna port p;k=5·m′+N _(sc) ^(RB) ·n _(PRB)+1, or k=5·m′+N _(sc) ^(RB) ·n _(PRB);s=(−1)^(n) ^(PRB) ^(+m′), or s=(−1)^(n) ^(PRB) ^(+m′+n) ^(s) , ors=(−1)^(n) ^(PRB) ^(+m′+└l′/2┘), or s=1; m′=0, 1 or 2; n_(PRB) refers toan index of a physical RB allocated by the system; N_(sc) ^(RB) refersto a number of sub-carriers contained in one RB.
 4. The method of claim1, further comprising mapping the reference signal sequence to alocation a_(k,l) ^((p)) of a sub-carrier k on the symbol l of an antennaport p according to a following expression:$a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)}} & {{{when}\mspace{14mu} p} = 8}\end{matrix} \right.$ wherein, a_(k,l) ^((p)) refers to a location ofthe sub-carrier k on the symbol l of the antenna port p;k=5·m′+N _(sc) ^(RB) ·n _(PRB)+1, or k=5·m′+N _(sc) ^(RB) ·n _(PRB);s=(−1)^(n) ^(PRB) ^(+l′+m′), or s=(−1)^(n) ^(PRB) ^(+l′+m′+n) ^(s) , ors=(−1)^(n) ^(PRB) ^(+l′+m′+└l′/2┘), or s=(−1)^(l′); m′=0, 1 or 2;n_(PRB) refers to an index of a physical RB allocated by the system;N_(sc) ^(RB) refers to a number of sub-carriers contained in one RB. 5.The method of claim 1, further comprising mapping the reference signalsequence to a location a_(k,l) ^((p)) of a sub-carrier k on the symbol lof an antenna port p according to the following expression:$a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)}} & {{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 0}} \\{{- s} \cdot {r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)}} & {{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 1}}\end{matrix} \right.$ wherein, a_(k,l) ^((p)) refers to a location ofthe sub-carrier k on the symbol l of the antenna port p;k=5·m′+N _(sc) ^(RB) ·n _(PRB)+1, or k=5·m′+N _(sc) ^(RB) ·n _(PRB);s=(−1)^(n) ^(PRB) ^(+m′), or s=(−1)^(n) ^(PRB) ^(+m′+n) ^(s) , ors=(−1)^(n) ^(PRB) ^(+m′+└l′/2┘), or s=1; m′=0, 1 or 2; n_(PRB) refers toan index of a physical RB allocated by the system; N_(sc) ^(RB) refersto a number of sub-carriers contained in one RB.
 6. The method of claim1, wherein, the special subframe is a subframe containing DwPTS timeslots.
 7. A system for mapping a reference signal sequence in anadvanced long term evolution system, which is used to map the referencesignal sequence to an orthogonal frequency division multiplexing symboll, comprising a mapping module, the mapping module is configured todetermine the symbol l according to following expressions when thesystem uses a normal cyclic prefix: $l = \left\{ {{\begin{matrix}\left. {{l^{\prime}{mod}\; 2} + 2 + {3 \cdot \left\lfloor {l^{\prime}/2} \right\rfloor}} \right) & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\{{l^{\prime}{mod}\; 2} + 2} & {{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a}\mspace{14mu}} \\\; & {{{special}\mspace{14mu} {subframe}},} \\\; & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}}\mspace{14mu}} \\\; & {{{subframe}\mspace{14mu} {is}\mspace{14mu} 3},{4\mspace{14mu} {or}\mspace{14mu} 8}} \\{{l^{\prime}{mod}\; 2} + 5} & {{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} a\mspace{14mu} {non}\text{-}} \\\; & {{special}\mspace{14mu} {subframe}}\end{matrix}l^{\prime}} = \left\{ \begin{matrix}\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}}}\mspace{14mu}} \\\; & {{a\mspace{14mu} {special}\mspace{14mu} {subframe}},} \\{0,1,2,3} & {{{and}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}}\mspace{14mu}} \\\; & {{{is}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 0},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}}}\mspace{14mu}} \\\; & {{a\mspace{14mu} {special}\mspace{14mu} {subframe}},} \\0.1 & {{{or}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {{{not}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}} \\\; & {{{{n_{s}{mod}\; 2} = 1},{{when}\mspace{14mu} {the}\mspace{14mu} {current}\mspace{14mu} {subframe}\mspace{14mu} {is}\mspace{14mu} {not}}}\mspace{14mu}} \\\; & {{a\mspace{14mu} {special}\mspace{14mu} {subframe}},} \\{2,3} & {{{or}\mspace{14mu} a\mspace{14mu} {configuration}\mspace{14mu} {of}\mspace{14mu} {the}\mspace{14mu} {special}\mspace{14mu} {subframe}\mspace{14mu} {is}}\mspace{14mu}} \\\; & {{{not}\mspace{14mu} 1},2,{6\mspace{14mu} {or}\mspace{14mu} 7}}\end{matrix} \right.} \right.$ wherein, n_(s) is an index of a time slotin a radio frame.
 8. The system of claim 7, further comprising a firstacquiring module and a second acquiring module, wherein, the firstacquiring module is configured to acquire the index n_(PRB) of thephysical RB allocated by the system; the second acquiring module isconfigured to acquire the number N_(sc) ^(RB) of the sub-carrierscontained in the RB; wherein, the mapping module is further configuredto map the reference signal sequence to a location a_(k,l) ^((p)) of asub-carrier k on the symbol l of an antenna port p according to theindex n_(PRB) of the physical RB, the number N_(sc) ^(RB) of thesub-carriers and a following expression:$a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)}} & {{{{when}\mspace{14mu} p} = 8},}\end{matrix} \right.$ wherein, k=5·m′+N_(sc) ^(RB)·n_(PRB)+1, ork=5·m′+N_(sc) ^(RB)·n_(PRB);s=(−1)^(n) ^(PRB) ^(+l′+m′), or s=(−1)^(n) ^(PRB) ^(+l′+m′+n) ^(s) , ors=(−1)^(n) ^(PRB) ^(+l′+m′+└l′/2┘), or s=(−1)^(l′); m′=0,1or2;alternatively, $a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)}} & {{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 0}} \\{{- s} \cdot {r\left( {{12 \cdot n_{PRB}} + {3 \cdot l^{\prime}} + m^{\prime}} \right)}} & {{{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 1}},}\end{matrix} \right.$ wherein, s=(−1)^(n) ^(PRB) ^(+m′), or s=(−1)^(n)^(PRB) ^(+m′+n) ^(s) , or s=(−1)^(n) ^(PRB) ^(+m′+└l′/2┘), or s=1;alternatively, $a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)}} & {{{{when}\mspace{14mu} p} = 8},}\end{matrix} \right.$ wherein, s=(−1)^(n) ^(PRB) ^(+l′+m′), ors=(−1)^(n) ^(PRB) ^(+l′+m′+n) ^(s) , or s=(−1)^(n) ^(PRB)^(+l′+m′+└l′/2┘), or s=(−1)^(l′); alternatively,$a_{k,l}^{(p)} = \left\{ \begin{matrix}{r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)} & {{{when}\mspace{14mu} p} = 7} \\{s \cdot {r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)}} & {{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 0}} \\{{- s} \cdot {r\left( {{3 \cdot n_{PRB}} + m^{\prime} + {3 \cdot l^{\prime} \cdot N_{RB}^{\max,{DL}}}} \right)}} & {{{{when}\mspace{14mu} p} = {{8\mspace{14mu} {and}\mspace{14mu} l^{\prime}{mod}\; 2} = 1}},}\end{matrix} \right.$ wherein, s=(−1)^(n) ^(PRB) ^(+m′), or s=(−1)^(n)^(PRB) ^(+m′+n) ^(s) , or s=(−1)^(n) ^(PRB) ^(+m′+└l′/2┘), or s=1; 9.The system of claim 7, wherein, the special subframe is a subframecontaining DwPTS time slots.
 10. The method of claim 2, wherein, thespecial subframe is a subframe containing DwPTS time slots.
 11. Themethod of claim 3, wherein, the special subframe is a subframecontaining DwPTS time slots.
 12. The method of claim 4, wherein, thespecial subframe is a subframe containing DwPTS time slots.
 13. Themethod of claim 5, wherein, the special subframe is a subframecontaining DwPTS time slots.
 14. The system of claim 8, wherein, thespecial subframe is a subframe containing DwPTS time slots.